Foldable lap desk



FIG. 1 is a front, top and left side perspective view of a foldable lap desk showing my new design;

FIG. 2 is a back, bottom and right side perspective view thereof; and,

FIG. 3 is a left side elevational view thereof, and a mirror image of the right side. 

The ornamental design for a foldable lap desk, as shown and described. 